Erbium-doped fluoride fiber laser device and laser generation method

Abstract

The invention provides an erbium-doped fluoride fiber laser device and a laser generation method. The laser device comprises at least one pump laser device, a beam combiner, a first fiber bragg grating, a second fiber bragg grating, a double-cladding erbium-doped fluoride fiber, a third fiber bragg grating and an AlF3 end cap. The laser device is advantaged in that 1.6 mu m laser is constrained bya second optical resonant cavity formed by the first fiber bragg grating and the third fiber bragg grating, finally, absorbed and pumped to an energy level 4I9 / 2 by an excited state energy level 4I13 / 2 of the erbium ions, through multi-phonon relaxation, the energy level is returned to 4I11 / 2, particles with the energy level of 4I11 / 2 can be transited to the energy level of 4I13 / 2 through the pump light to generate 2.8 mu m laser, the laser of 1.6 mu m is not only recycled, but also particles on the energy level 4I13 / 2 are recycled, the oscillation self-termination effect of the laser of 2.8mu m is reduced, and the energy utilization rate of the laser device is greatly improved.

Description

technical field [0001] The invention belongs to the field of laser technology, and in particular relates to an erbium-doped fluoride fiber laser and a laser generating method. Background technique [0002] As a new type of laser, fiber laser has natural advantages such as high conversion efficiency, good beam quality, compact structure, good portability, and easy commercialization, and has always been the focus of attention. Among them, the mid-infrared 2.8μm band fluoride fiber laser has attracted much attention. With the continuous improvement of mid-infrared fluoride fiber material technology, the obtained 2.8μm band laser output power is also getting higher and higher. Application has become a hot research area for researchers. [0003] Currently, ~2.8μm band lasers are typically pumped by 976nm lasers doped with Er 3+ Fluoride fiber, through the energy level of erbium ions 4 I 11 / 2 jump to energy level 4 I 13 / 2 acquired. However, on the one hand, this scheme is ...

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Problems solved by technology

[0005] In view of the deficiencies in the above-mentioned prior art, the object of the present invention is to provide a kind of erbium-doped fluoride fiber laser and laser producing method, overcome present 2.8 μ m erbium-doped fluoride laser erbium ions in the excitation level 4 I 13 / 2 The energy level lifetime on the 4 I 11 / 2 The energy-level lifetime of , leading to self-termination of laser energy-level transitions, and in the energy-level 4 I 13 / 2 and 4 I 15 / 2 A 1.6μm laser will be generated between them, which will reduce the efficiency of the fiber laser and this part of the energy will not be utilized, resulting in a large amount of heat, which limits the further improvement of the laser output power.

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